method for using tracer return flow to estimate fluid inflow volumes from different inflow zones

摘要

method for using tracer return flow to estimate fluid inflow volumes from different inflow zones. The invention relates to a method for estimating an inflow profile (q ~ i) for at least one of the well fluids (oil, gas, or water) for an oil well (1) with inflow locations (3). 31, 32, 33) for a production stream (f) comprising: arranging tracer sources (4, 41, 42, 43) with tracer materials (4m, 41m, 43m) at known well levels by downstream and exposed to fluids within said inflow zones (3, 31, 32, 33), each tracer source (4, 41, 42, 43) having a uniform release rate (q ~ t ~ 41). ~, q ~ t ~~ 42 ~, q ~ t ~~ 43 ~ ...) for said well fluid, inducing a transient in the production rate (q) of the entire production flow (30) by shutting off a valve in the changing local exposure times from tracer sources (4, 41, 42, 43) to fluid, collect samples (c) downstream at known sampling times (t1, t2, ...), analyze said samples (cn, c n + 1, ...) as to the concentration (4c) and type of plotter material (4m) for said possible sources (4), based on said concentrations (4c) and their sampling sequence and well geometry, calculate the inflow volumes (q ~ i). ~) of flow models.